Heißkanaldüsen Typ SLT/-DLT Customer information

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Heißkanaldüsen Typ SLT/-DLT Preventing flow marks on injection molded parts Apart from flow marks being avoided, two further quality features of the manufacturing process have caught Mr. Puppe's eye: “Virtually no warpage and no sink marks on the whole length of the light covering panels, this is really amazing. We would not have been able to get such a result with conventional nozzles.” Last but not least, the design of the new nozzle enables particularly fast color changes. This is because the melt channel is designed to optimize flow so that the material comes to rest nowhere, which results in an optimal melting process. „Without a nozzle type with a multi-purpose pluggable tip, we would have had to use a 2-drop manifold for this application, “ adds Puppe, „this would have forced up the prices. The costs of a nozzle with a multi-purpose pluggable tip are only marginally higher than those of a conventional nozzle. Thus, better Werner Puppe product characteristics are technichal manager, combined with decreased process at Werner Langer, costs.“ a plastics processing, company from Meschede Molds on hand can be retooled The multi-purpose pluggable tip is intended primarily for parts that have to meet demanding requirements for optical clarity, such as, for example, applications involving polycarbonate or PMMA, or perhaps POM homopolymers. “No applications using fiberglassreinforced plastics have been implemented so far. However, they are also possible if the tip is made of hard metal,” says Ehlert. The customer of Werner Langer chose an opaque white shade for the light covering panels, which limited the selection of the material right from the start. A PMMA- type material, optimized for transparency and lack of streaks, is used for this application. Since the part is closed on the one side and open on the other, different flow paths in the mold are the result. To obtain a proper nozzle position, a mold flow analysis was carried out to come up with an off-center positioning of the nozzle. “During the sampling inspection as well as when starting up the mold, there was not a single problem with the hot runner nozzle,” says Puppe. “Plug&Play”, this is how he describes the change-over to the new nozzle concept. The tool is installed in an Engel injection molding machine, type 1050/200, with a clamping force of 2,000 kN. A linear handling device takes the parts and puts them on a conveyor belt where they are manually packaged. Molds on hand can be retooled with the new kind of nozzle. In fact, the installation of a nozzle with a multi-purpose pluggable tip requires just a little modification of the mold contour. “However, only very small modifications are necessary to replace a GÜNTHER hot runner nozzle,” says Ehlert. Wide range of applications It is only natural that recently developed products, such as the multi-purpose pluggable tip, which are relatively new on the market do not immediately become widespread in applications. First of all, it is necessary to gain experience, and test the basic applications in longterm studies. For one and a half years now, the multipurpose pluggable tip has been included in the product range offered by GÜNTHER. The market entry phase is over, and Ehlert sees large areas of application, for instance, in the automotive industry, as well as for every application which requires optical parts. For Werner Langer, the testing phase is over for some time already, at least with regard to the light covering panels; the production is a complete success. Puppe is confident: “When it comes to the production of optically demanding parts, we will continue using the nozzle with a multi-purpose pluggable tip.” For any questions, please contact our Application Engineering department at +49 (0) 6451 5008-31 or -63. The information is given in accordance with our present-day knowledge and is meant to provide technical background. 1.5. 12 iA Customer information The light covering panels are manufactured on an Engel injection molding machine, type 1050/200, with a clamping force of 2,000 kN. www.guenther-hotrunner.com Subject to technical changes 7/12
Heißkanaldüsen Customer information Typ SLT/-DLT Hot runner technology for medical products: Precision millions of times Mini-Spike and Transofix, these are the names of two products manufactured by B.Brown, a healthcare company. These medical products are provided with protective caps which, manufactured with high precision, are required in millions of units every year. To guarantee a trouble-free production, the company trusts in systems supplied by GÜNTHER Heißkanaltechnik. The first product serves as a withdrawal and injection spike for multi-dose containers, the second one as a transfer device for sterile liquids, e.g. for drug admixture. In spite of the high number of pieces, precision has the highest priority when producing protective caps. „The force fit of the protective caps must be manufactured in such a way that on the one hand the caps do not get lost during transportation of medical products, but on the other hand can nevertheless be easily withdrawn,” says Stefan Moser, a project manager at B.Braun Melsungen AG. “And this must also be possible when the user is wearing Latex gloves which can additionally be moistened with liquids like solvents.“ Until the conversion of production at the beginning of 2007, the company had manufactured protective caps using two conventionally designed multi-cavity molds with multi-tip nozzles. Picture: Parting line 1 of the tandem mold is intended for manufacturing the Mini-Spike protective cap, parting line 2 (pictured) for manufacturing the Transofix protective cap The conversion of production was triggered by the fact that, first, those molds with a low number of cavities could no longer provide the required production volume and, second, the Mini-Spike tool had reached its wear limit. The tandem technology seemed to be appropriate to solve the quantity problem. By this method two different parts can be separately and individually injection molded in an overlapping injection cycle on an injection molding machine using a tandem mold provided with two parting lines. The volumes and the quantity of pieces can be set individually for each parting line. The gating system of the tandem mold consists of an alternating slider with a bayonet socket, with one of the sides respectively locked and the other one unlocked for opening. “The design of the system is simple, rugged and not susceptible to malfunctions,” says Joachim Hammer, a machine setter and quality controller at the supplier from Melsungen. For any questions, please contact our Application Engineering department at + 49 (0) 6451 5008-31 or -63. The information is given in accordance with our present-day knowledge and is meant to provide technical background. www.guenther-hotrunner.com 7/12 Subject to technical changes iA Picture: Stefan Moser, project manager (left), Benjamin Koch, responsible for machine optimization (middle), and Joachim Hammer (right), machine setter and quality controller at Braun Melsungen 1.5. 13
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Heißkanaldüsen Typ SLT/-DLT Customer information

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